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Diodes Semiconductor Electronic Components Datasheet

AP3211H Datasheet

1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER

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AP3211H pdf
PART OBSOLETE - USE AP3211 and AP5100
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H
General Description
The AP3211H is a 1.4MHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 1.5A load with high efficiency,
excellent line and load regulation. The device
integrates N-channel power MOSFET switch with
low on-resistance. Current mode control provides fast
transient response and cycle-by-cycle current limit.
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3211H. This feature greatly simplifies the
design of switch-mode power supplies.
The AP3211H is available in SOT-23-6 package.
Features
Input Voltage Range: 4.5V to 23V
Fixed 1.4MHz Frequency
High Efficiency: up to 92%
Output Current: 1.5A
Current Mode Control
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Built-in UVLO Function
Built-in Over Voltage Protection
Built-in Soft-start
Applications
LCD TV
DPF
Portable DVD
SOT-23-6
Figure 1. Package Type of AP3211H
Jun. 2014 Rev. 2. 4
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3211H Datasheet

1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER

No Preview Available !

AP3211H pdf
PART OBSOLETE - USE AP3211 and AP5100
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H
Pin Configuration
K Package
(SOT-23-6)
Pin 1 Mark
BS 1
GND 2
FB 3
6 SW
5 IN
4 EN
Figure 2. Pin Configuration of AP3211H (Top View)
Pin Description
Pin Number
1
2
3
4
5
6
Pin Name
BS
GND
FB
EN
IN
SW
Function
Bootstrap pin. A bootstrap capacitor is connected between the
BS pin and SW pin. The voltage across the bootstrap
capacitor drives the internal high-side NMOS switch
Ground pin
Feedback pin. This pin is connected to an external resistor
divider to program the system output voltage. When VFB
exceeds 20% of the nominal regulation value of 0.81V, the
OVP is triggered. When VFB0.25V, the oscillator frequency
is lowered to realize short circuit protection
Control input pin. Forcing this pin above 1.5V enables the IC.
Forcing this pin below 0.4V shuts down the IC. When the IC
is in shutdown mode, all functions are disabled to decrease
the supply current below 1A
Supply input pin. A capacitor should be connected between
the IN pin and GND pin to keep the DC input voltage
constant
Power switch output pin. This pin is connected to the inductor
and bootstrap capacitor
Jun. 2014 Rev. 2. 4
BCD Semiconductor Manufacturing Limited
2


Part Number AP3211H
Description 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
Maker BCD
Total Page 12 Pages
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